CIRCULAR-DICHROISM MICROSPECTROSCOPY - EVIDENCE OF BROKEN SYMMETRIES IN HIGH-TC SUPERCONDUCTING FILMS

被引：5

作者：

FABRE, JC

BOCCARA, AC

机构：

[1] Laboratoire d'Optique Physique, U.P.R.A. 005 CNRS, 75231 Paris Cedex 05

来源：

OPTICS COMMUNICATIONS | 1992年 / 93卷 / 5-6期

关键词：

D O I：

10.1016/0030-4018(92)90190-3

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

We have built a visible and near ir Fourier transform dichrometer able to perform spectra with a 8 mum spatial resolution. Circular dichroism (CD) measurements in the transmission on two superconducting thin films of YBa2Cu3O7 and Bi2Sr2Ca2Cu3O10 have been performed in the spectral range 13000-21000 cm-1. In the first film below the transition temperature, a CD signal (absorbance unit) up to few times 10(-4) has clearly appeared far above the limit of sensitivity of our detection (deltaA=2 X 10(-5)). This value of deltaA corresponds to a rotation angle of a linearly polarized was deltaphi=10(-5) rad. In the normal state no detectable CD signal has been observed. All the signals with the second film were found to be below our detection limit at any temperature.

引用

页码：306 / 310

页数：5

共 22 条

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[2] THE RESONATING VALENCE BOND STATE IN LA2CUO4 AND SUPERCONDUCTIVITY [J].